[Bug libc/18235] New: utmpx struct's ut_tv member has wrong type on x86_64 linux

[Bug libc/18235] New: utmpx struct's ut_tv member has wrong type on x86_64 linux

[nszabolcs at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18235

            Bug ID: 18235
           Summary: utmpx struct's ut_tv member has wrong type on x86_64
                    linux
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
                CC: drepper.fsp at gmail dot com

ut_tv member is required to have type struct timeval

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/utmpx.h.html

the following code fails on x86_64 linux:

#define _XOPEN_SOURCE 700
#include <utmpx.h>
void f()
{
struct utmpx x;
struct timeval *p = &x.ut_tv; // warning: initialization from incompatible
pointer type [enabled by default]
}

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[Bug libc/18235] utmpx struct's ut_tv member has wrong type on x86_64 linux

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18235

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |fweimer at redhat dot com
         Resolution|---                         |WONTFIX
              Flags|                            |security-

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
We cannot fix this because for bi-arch systems, we want compatibility with the
32-bit utmpx struct layout, per this comment:

/* The fields ut_session and ut_tv must be the same size when compiled
   32- and 64-bit.  This allows files and shared memory to be shared
   between 32- and 64-bit applications.  */

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